"I was deeply saddened to learn of the death of Singapore’s Minister Mentor, Lee Kuan Yew. On behalf of the American people, Michelle and I offer our deepest condolences to the Lee family and join the people of Singapore in mourning the loss of this remarkable man. A visionary who led his country from Singapore’s independence in 1965 to build one of the most prosperous countries in the world today, he was a devoted public servant and a remarkable leader. Minister Mentor Lee’s views and insights on Asian dynamics and economic management were respected by many around the world, and no small number of this and past generations of world leaders have sought his advice on governance and development. I personally appreciated his wisdom, including our discussions during my trip to Singapore in 2009, which were hugely important in helping me formulate our policy of rebalancing to the Asia Pacific. He was a true giant of history who will be remembered for generations to come as the father of modern Singapore and as one the great strategists of Asian affairs."

Former U.S. president George H. W. Bush also praised Lee's legacy.

"I am deeply saddened at the news of Lee Kuan Yew's passing. I respected his effective leadership of his wonderful, resilient and innovative country in ways that lifted living standards without indulging a culture of corruption. I was also proud of the progress Singapore and the United States achieved together as partners. Because of the example set by Lee Kuan Yew's singular leadership, let me add I am confident that the future will be bright for Singapore. Barbara and I and indeed the entire Bush family extend our heartfelt condolences to Prime Minister Lee's family and countrymen. I will always be proud that Lee Kuan Yew was my friend."

Australian Prime Minister Tony Abbott said the region owed much to Lee's vision and determination.

"Today we mourn the passing of a giant of our region. Fifty years ago, Lee Kuan Yew led a vulnerable, fledgling nation to independence. Today, thanks to his vision and determination, Singapore is one of the world's most successful countries. In Lee Kuan Yew's own words, Singapore's remarkable journey has been from 'third world to first.' Thanks to his leadership, Singapore is now one of the world's most prosperous nations, a financial powerhouse, and one of the world's easiest places to do business. Our region owes much to Lee Kuan Yew. Here in Australia and beyond, leaders sought and learned from his wise counsel. As Prime Minister, Lee Kuan Yew enjoyed close relationships with successive Australian prime ministers and worked with them to establish the strong partnership that Singapore and Australia have today. At every stage, Australia and Singapore have stood shoulder to shoulder. We continue to do so today as we salute one of the significant leaders of our time. On behalf of the Australian government and people, I extend my condolences to Mr. Lee's family and to the people of Singapore."

This week will be a national time of mourning, Lee Hsien Loong said in a statement.